<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<!--
1. 指数运算符(幂): **
2. Array.prototype.includes(value) : 判断数组中是否包含指定value
-->
<script type="text/javascript">
  console.log(3 ** 3) //幂运算 27

  let arr=[1,2,3,4,{aaa:'aaa'},'abc'];
  console.log(arr.includes('a')) //false
  console.log(arr.includes('abc')) //true
  console.log(arr.includes({aaa:'aaa'})) //false
</script>
</body>
</html>